#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
#include<assert.h>
size_t my_strlen(const char* arr)
{
	assert(arr != NULL);
	char* p = arr;
	while (* ++p);
	return p - arr;
}
int main()
{
	printf("%lld\n", strlen("hello bit"));
	printf("%lld\n", my_strlen("hello bit"));
	return 0;
}